As far as getting the "Our Price" in there, you can add it in includes/templates/YOUR_TEMPLATE/template/tpl_product_info_display.php by changing this:
Code:
echo $one_time . ((zen_has_product_attributes_values((int)$_GET['products_id']) and $flag_show_product_info_starting_at == 1) ? TEXT_BASE_PRICE : '') . zen_get_products_display_price((int)$_GET['products_id']);
to this:
Code:
echo $one_time . ((zen_has_product_attributes_values((int)$_GET['products_id']) and $flag_show_product_info_starting_at == 1) ? TEXT_BASE_PRICE : 'Our Price: ') . zen_get_products_display_price((int)$_GET['products_id']);
But as far as getting rid of the percentage off and such, I'd start a new thread about that in the general forum.
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